Nearly fifty people had to be rescued from Upper Red Lake in northern Minnesota on Sunday night.
Officials with Beltrami County says the group became stranded on a sheet of ice that broke away and began to drift after strong winds caused the ice to shift.
A spokesperson says that Upper Red Lake is a popular fishing destination and often utilized before ice is stable.
That means they have to rescue people either from falling through the ice or floating on ice floats.
The Minnesota DNR says at least four inches of ice is needed before going on a lake.
Here are those ice guidelines (for clear ice only):
Under four inches: stay off.
5-7 inches: Snowmobile or small ATV
7-8 inches: Side-by-side ATV
9-10 inches: Small car or SUV
11-12 inches: Medium SUV or small truck
13 inches: Medium truck
16-17 inches: Heavy-duty truck
20 inches or more: Heavy-duty truck with wheelhouse shelter
The DNR is clear about ice safety that there is no such thing as 100 percent safe ice.